[kontact] [Bug 420075] KMail/Kontact extremely slow to reply to long email thread

[Carsten Pfeiffer]

https://bugs.kde.org/show_bug.cgi?id=420075

--- Comment #2 from Carsten Pfeiffer <pfeiffer at kde.org> ---
I can confirm this on Debian with
- Kontact 5.19.3 (21.12.3)
- KDE Frameworks 5.94.0
- Qt 5.15.4 (built against 5.15.4)

Every backtrace I take when it's stuck contains
QSyntaxHighlighter::rehighlight().

And indeed, shortening the email makes the problem go away.

#0  0x00007f7bb7ded2f7 in QTextBlock::textDirection() const () from
/lib/x86_64-linux-gnu/libQt5Gui.so.5
#1  0x00007f7bb7e25722 in ?? () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#2  0x00007f7bb7e279a5 in ?? () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#3  0x00007f7bb7e2f7a7 in ?? () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#4  0x00007f7bb7e2fd9a in ?? () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#5  0x00007f7bb7e303c0 in QTextDocumentLayout::doLayout(int, int, int) () from
/lib/x86_64-linux-gnu/libQt5Gui.so.5
#6  0x00007f7bb7e3170b in QTextDocumentLayout::documentChanged(int, int, int)
() from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#7  0x00007f7bb7df242d in QTextDocument::markContentsDirty(int, int) () from
/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007f7bb7e526bb in ?? () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#9  0x00007f7bb7e5305f in ?? () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#10 0x00007f7bb7e531f7 in ?? () from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007f7bb7e53599 in QSyntaxHighlighter::rehighlight() () from
/lib/x86_64-linux-gnu/libQt5Gui.so.5
#12 0x00007f7ba7de6431 in Sonnet::Highlighter::slotRehighlight() () from
/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5
#13 0x00007f7bb78de013 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f7bb78e1eca in QTimer::timeout(QTimer::QPrivateSignal) () from
/lib/x86_64-linux-gnu/libQt5Core.so.5

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